Root distribution and interactions between intercropped species
Root distribution and interactions between intercropped species
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DOI：
10.1007/s00442-005-0256-4
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发表时间：
2006-03-01
期刊：
影响因子：
2.7
通讯作者：
Smith, SE
中科院分区：
文献类型：
--
作者：
Li, L;Sun, JH;Smith, SE
尽管生态学家和农学家认为植物根系的空间分布对自然和农业生态系统中的种间相互作用非常重要，但很少有实验研究量化了根系分布动态及其对种间相互作用的影响。通过田间试验研究了间作植物根系分布与种间相互作用的关系。在小麦（Triticum aestivum L.）中，根用螺旋钻取样两次，用整体法取样两次。玉米（Zea mays L.）和蚕豆（Vicia faba L.）/玉米间作和小麦、玉米、蚕豆单作可达100 cm深。结果表明，间作小麦根系在玉米植株下扩展，且在各土层的根长密度（RLD）均显著高于单作小麦。小麦间作玉米根系横向受到限制，但其RLD大于单作玉米。间作蚕豆对不同土层的RLD的影响程度小于间作小麦。蚕豆根系分布较浅，间作玉米根系分布在蚕豆下方。研究结果支持了以下假设：在蚕豆/玉米间作中，表现出不对称种间促进效应的物种的丰产是由于根系的横向分布和RLD的增加，间作物种根系空间分布的相容性有助于种间促进效应的对称性。
Even though ecologists and agronomists have considered the spatial root distribution of plants to be important for interspecific interactions in natural and agricultural ecosystems, few experimental studies have quantified patterns of root distribution dynamics and their impacts on interspecific interactions. A field experiment was conducted to investigate the relationship between root distribution and interspecific interactions between intercropped plants. Roots were sampled twice by auger and twice by the monolith method in wheat (Triticum aestivum L.)/maize (Zea mays L.) and faba bean (Vicia faba L.)/maize intercropping and in sole wheat, maize, and faba bean up to 100 cm depth in the soil profile. The results showed that the roots of intercropped wheat spread under maize plants, and had much greater root length density (RLD) at all soil depths than sole wheat. The roots of maize intercropped with wheat were limited laterally, but had a greater RLD than sole-cropped maize. The RLD of maize intercropped with faba bean at different soil depths was influenced by intercropping to a smaller extent compared to maize intercropped with wheat. Faba bean had a relatively shallow root distribution, and the roots of intercropped maize spread underneath them. The results support the hypotheses that the overyielding of species showing benefit in the asymmetric interspecific facilitation results from greater lateral deployment of roots and increased RLD, and that compatibility of the spatial root distribution of intercropped species contributes to symmetric interspecific facilitation in the faba bean/maize intercropping.